Di Modica's bull meant one thing to him when he made it. Now it means millions of different things to the people who consider it every day. If he wanted to maintain full control over the meaning of his work, he should have kept it in his private studio and not let anyone look at it without him standing by to explain the piece and answer any questions.
Similarly, Fearless Girl meant something specific to the asset management company that commissioned it, and something else to the artist who sculpted it. But now it takes on new meaning to everyone who encounters it. What it means to any given individual may or may not incorporate any of the intended meaning, and that doesn't make it any more or less valid.
If digging into the origins of the statues helps give them meaning to you, that's great. But most people who encounter them necessarily appreciate them at face value, and that's great too, because deriving meaning from art is intensely personal.
And beyond taking on different meaning to each individual, as time progresses and the world continues to evolve, so too will the symbolic value of any work of art placed into the world. God knows the Charging Bull has taken on a lot of additional meaning to a lot of people since '08. How did Di Modica feel about how that event 'changed the meaning' of his work?
If you don't like a work of art, that's fine. But no one has the authority to tell someone else what it should mean to them.